<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <script src="jquery-3.3.1.js"></script>
    <title>tetris</title>
    <style>

    #start, #new {
        height: 25px;
        width: 50px;
        border-radius: 8px;
        text-align: center;
        line-height: 25px;
        font-size: 20px;
        color: white;
        background-color: #42CCCE;
        margin-bottom: 10px;
    }
    </style>
</head>

<body>
    <div id="start">start</div>
    <div id="new">new</div>
    <script src="popup.js">
    </script>
</body>

</html>